Study on Toughening of the Epoxy

摘要

The effect of hydroxy-terminated polybutadiene liquid rubber (HTPB) and softened agent on the performance of epoxy resin are studied.The mechanical properties of the composites investigated and the toughening mechanism were studied trough the SEM.In the HTPB/epoxy resin composites,the hardness is reduced but the elongation and the shear strength increased.Added 20wt％HTPB,the breaking elongation can be up to 16.19％ and the shear strength rise to 13.74MPa.From the images of the SEM,the globular and trumpet-like hole and shear zone can hinder the development of the cracks,thus increasing the toughness of the epoxy resin.In the softened agent/epoxy resin composites,The addition of the softened agent,the breaking elongation and the impact strength have increased.From the images of SEM,we found that,with the addition of the softened agent,the single phase structure turns to two-phase structure and the bicontinuous phase and the brittle fracture turns to ductile fracture.